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›› 2008, Vol. 8 ›› Issue (5): 866-871.

• 反应与分离 • 上一篇    下一篇

碱法钛白清洁生产工艺中循环碱液的杂质分离

林琳 王丽娜 薛天艳 初景龙 齐涛 王京刚   

  1. 北京化工大学化工学院环境科学与工程系 中国科学院过程工程研究所绿色过程与工程重点实验室 大连理工大学化工学院 中国科学院过程工程研究所绿色过程与工程重点实验室 中国科学院过程工程研究所绿色过程与工程重点实验室 北京化工大学化学工程学院
  • 收稿日期:2008-07-22 修回日期:2008-07-31 出版日期:2008-10-20 发布日期:2008-10-20
  • 通讯作者: 齐涛

Separation of Impurity from Recycled Alkaline Solution in the Clean Production Process of Titanium Dioxide

LIN Lin WANG Jing-gang WANG li-na CHU Jing-long QI Tao XUE Tian-yan   

  1. Dep. Environ. Sci. & Eng., Institute of Chemical Engineering, Beijing University of Chemical Technology Institute of Process Engineering, Chinese Academy of Sciences School of Chemical Engineering, Dalian University of Technology Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences College of Chem.Eng.,Beijing University of Chemical Technology and Engineering
  • Received:2008-07-22 Revised:2008-07-31 Online:2008-10-20 Published:2008-10-20
  • Contact: QI Tao

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摘要： 研究了碱法钛白清洁生产工艺循环碱液中关键组分锰、硅、铝的去除方法，考察了添加剂用量、反应温度等对去除杂质离子的影响. 结果表明，当反应温度为90℃、还原剂与碱液体积比为1:200时，Mn(VI)的去除率可达到99.7%；在70~90℃之间，添加适量CaO，可将碱液中铝含量(以Al2O3计)由10.03 g/L降至1 g/L，将硅含量(以SiO2计)由2.70 g/L降至0.2 g/L. 经XRD分析，无铝存在时脱硅产物为1.5CaO·SiO2·xH2O，有铝存在时脱硅铝产物为Ca2.93Al1.97Si0.64O2.56(OH)9.44.

关键词: 循环碱液, 杂质, 脱除, 还原剂, 氧化钙

Abstract: The separation of Mn, Al and Si from the recycled alkaline solution was investigated. The results showed that approximately 99.7% of Mn(VI) in the recycled alkaline solution could be removed in the optimal conditions of temperature 90℃ and volume ratio of reductant to solution 1:200. The concentrations of Al and Si in the recycled alkiline solution could be reduced to 1 and 0.2 g/L, respectively at 70~90℃ with added adequate amount of CaO. The XRD analysis results suggested that the main product was 1.5CaO×SiO2×xH2O when aluminium was absent, while it was Ca2.93Al1.97Si0.64O2.56(OH)9.44 when aluninium was present.

Key words: recycled alkaline solution, impurity, removal, reductant, CaO

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